This is 19-year-old Baylor University student Jazz Johnson. And that is the calculator app that all iPhone users use and are familiar with — or so you thought.

Jazz Johnson

Apple

Other than some cosmetic updates, the iPhone calculator has virtually stayed the same on every iteration of the iPhone. But a whole bunch of people just learned about a pretty basic capability that's changed their whole lives. All thanks to Johnson and an old Reddit thread he recently came across.

Johnson told BuzzFeed News he himself had no idea the iPhone calculator app had this function. In fact, "I have actually thrown my phone out of frustration when messing up a calculation," he said.

When he stumbled upon the Reddit post from user sweetbabyapplepie from 2014, his world was rocked. "It certainly has made my life easier," he said.

Johnson then made a quick video about it to let his friends and followers all know that YES, YOU CAN SIMPLY SWIPE LEFT OR RIGHT TO CORRECT A NUMBER IN YOUR CALCULATIONS INSTEAD OF STARTING OVER EACH TIME.